End-to-end procurement automation from purchase request through PO issuance: request submitted via form or email, routed to budget owner for approval, PO generated in your ERP (SAP MM, NetSuite, Dynamics), and emailed to the vendor without manual data entry at each step. Webhook triggers on PO acknowledgement from the supplier update the ERP record automatically, eliminating the manual confirmation step that AP teams currently chase by phone.
Invoice receipt triggers a three-way match against the approved PO and goods receipt confirmation before routing to payment authorisation, invoices that do not match on quantity, unit price, or supplier identity hold for AP review rather than passing through unchecked. The matching logic is implemented as an Apache Airflow DAG for scheduled batch processing of high-volume invoice queues, or as an event-driven n8n workflow for lower-volume environments where an AP clerk processes invoices on receipt. Retry logic on the ERP posting step uses exponential backoff (initial 30s, maximum 5 retries) before routing failed postings to a dead letter queue with a Slack alert to the finance operations team for investigation.
Expense reports validated against policy (within category limits, receipts attached, approver matches org chart) before reaching the finance team. Audit logging captures every state transition, request submitted, PO approved, invoice received, matched, approved, paid, with actor, timestamp, and the field values at each stage, producing a complete paper trail for audit without manual documentation.